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Published byMatthew Foster Modified over 9 years ago
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Z 2 O 6 3- (aq) + JO 2 - (aq) J 2 O 7 2- (aq) + Z 7 O 4 3+ (aq) 68H + (aq) + 41e - +7 Z 2 O 6 3- (aq) 2Z 7 O 4 3+ (aq) + 34H 2 O(l) 3H 2 O(l) + 2JO 2 - (aq) J 2 O 7 2- (aq) +6H + (aq) + 6e - 82JO 2 - (aq) + 42Z 2 O 6 3- (aq) + 162H + (aq) 41J 2 O 7 2- (aq)+ 12Z 7 O 4 3+ (aq) + 81H 2 O(l)
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REDOX REACTIONS TODAY: We’re going to perform calculations to determine the quantities of substances involved in redox titrations In other words we’re going to learn the stoich involved for our lab
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REDOX STOICHIOMETRY
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Stoichiometry the study of the quantitative aspects of chemical reactions how much of each substance we need in a reaction
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Stoich allows us to use concentration equations to find unknown value in REDOX
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Titration Slowly add 1 solution (titrant) to another solution (sample) As the titrant is added to the sample, the 2 solutions react
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As more titrant is added a redox reaction occurs until equilibrium is reached and the reaction can no longer proceed
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2 strong oxidizing agents often used are solutions containing permanganate ions (MnO 4 - ) or dichromate ions (Cr 2 O 7 2- )
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The endpoint can be seen when the addition of ONE DROP of the titrant causes a permanent color change in the sample. That is when no more of the sample is available to react with the titrant
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Titration Calculations Using the known concentration and volume of the titrant we can find the moles used Using the stoichiometric ratio we can find the moles of the sample reacting
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With the moles of the sample known, we can use our known volume to find the concentration of the sample
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Very Important! The only difference in redox stoich vs regular stoich is you determine the balanced equation through half reactions and the net equation!
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Example 1: Find the concentration of Fe2+(aq) in a 10.0mL sample that requires 14.0mL of a 0.050mol/L acidic permanganate solution to reach the endpoint.
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Example 2: Find the concentration of Sn 2+ (aq) in a 50.0mL sample that requires 64.8mL of a 0.080mol/L acidic dichromate solution to reach the endpoint.
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